Load occurrence dataset

Occurrences and lineages through time

Raw data

OTT measures the number of occurrences at each time point directly from their ages. expertLTT and empiricalLTT capture lineage counts, with the former based on speciation and extinction dates, while the latter depends on observations (first and last appearances).

Plot the number of occurrences and lineages through time

Standardized counts and subsampling

Standardize the number of occurrences by the number of lineages, and subsample to erase the sampling bias. Subsampling is done by calculating the probability for each row, interpolating for time points between values, and subsampling accordingly.

               0    10    20    30    40    50    60   70
triton    260000 77000 25000 19000 17000 13000 11000 2600
triton.ss  16000 24000 20000 17000 16000 13000  9200 1100

One problem with this method is that it requires having a comprehensive and reliable estimate of the number of lineages through time from experts, which is not available for most clades.

Geographic subsampling

Null model of fossil sampling based on plate technotics

This part processes plate tectonic data to model water depths over the Cenozoic.

Geographic null model: Uniform sampling of marine points from each depth raster in cells deeper than 200m, drawing in each bin the same number of occurrences as in Triton, to simulate random sampling of fossils across the Cenozoic.

Null distributions of latitude and longitude for the uniformly sampled fossils, allowing a comparison of uniform fossil sampling with actual fossil occurrences.

Let’s subsample by optimizing the sampling probability based on deviations from the expected distributions over time, latitude and longitude.

[1] "Iteration: 1"
[1] "Iteration: 2"
[1] "Iteration: 3"
[1] "Iteration: 4"
[1] "Iteration: 5"
[1] "Iteration: 6"
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[1] "Iteration: 5"
[1] "Iteration: 6"
[1] "Iteration: 7"
[1] "Iteration: 8"
[1] "Iteration: 9"
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                 0    10    20    30    40    50    60   70
triton      260000 77000 25000 19000 17000 13000 11000 2600
triton.ss6   15000 26000 18000 17000 14000 13000  8600  650
triton.ss15   2300  3400  2300  1900  2000  1900  1300   59
triton.ss20    570   850  1000   600   750   720   450    7

This method reduces the temporal and geographical biases, but requires again to know the expected temporal richness trajectory. Let’s try a subsampling method that does not use this information.

Hole-based subsampling

In this section, we aim to reduce sampling biases in our dataset by performing subsampling based on drilling holes (locations where fossils were collected). The goal is to achieve a more uniform sampling effort across different holes and through time.

Calculating Occurrence Density per Hole

This plot highlights holes with unusually high densities that may introduce sampling bias.

Subsample at the Sediment Sample level

In this section, we focus on subsampling at the sample level to reduce sampling biases by homogenizing the number of sediment samples per hole through time. This method aims to create a more balanced dataset by adjusting for overrepresented holes and time periods.

Visualizing the Occurrence Density per Sample and the Sample Density per Hole

  • HoleNbSample: Number of unique samples collected from each hole.
  • HoleDtySample: Density of samples per hole, adjusted for the duration of sampling at each hole.
  • STT: Number of samples collected at each time point.

The mean number of occurrences per sample looks much more like the distribution of species over time. Let’s look at this quantity directly.

  • SpHTT = Samples per hole through time
  • OpSTT = Occurrences per sample through time

Subsampling - Homogenize the Number of Samples Through Time (ss.STT)

quartz_off_screen 
                2 
quartz_off_screen 
                2 

The number of occurrences after subsampling reflects very well the number of lineages designed by experts.

Check spatial biases

Registered S3 method overwritten by 'data.table':
  method           from
  print.data.table     

Compare to simulated homogeneous sampling

Save objects

---
title: "Subsampling the Triton datase - Temporal rarefaction"
output: html_notebook
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = FALSE)
```

```{r include=FALSE}
library("ggplot2")
library("raster")
library("terra")
```

# Load occurrence dataset

```{r}
triton <- read.csv("../../3-Data_processed/Triton_occurrences/TritonDB_trimmed_runif.csv", row.names=1)
```

# Occurrences and lineages through time
## Raw data

`OTT` measures the number of occurrences at each time point directly from their ages. `expertLTT` and `empiricalLTT` capture lineage counts, with the former based on speciation and extinction dates, while the latter depends on observations (first and last appearances).

```{r}
time_points <- 0:330/5
#time_points <- 0:66
OTT <- sapply(time_points, function(ti)sum(abs(triton$age_runif - ti) <= diff(time_points)[1]/2))
expertLTT <- sapply(time_points, function(ti)length(unique(triton[triton$Speciation >= ti & ti >= triton$Extinction,]$species)))
empiricalLTT <- sapply(time_points, function(ti)length(unique(triton[abs(triton$age_runif - ti) <= diff(time_points)[1]/2,]$species)))
```

Plot the number of occurrences and lineages through time

```{r fig.asp=0.3, fig.width=12}
par(mfrow=c(1,3))
plot(time_points, OTT, type="l", main="Distribution of occurrences through time", col="dodgerblue4")
points(time_points, OTT, pch=19, cex=0.5, col="dodgerblue4")
plot(time_points, expertLTT, type="l", ylim=c(0,120), col="orchid4", main="Number of lineages through time")
points(time_points, expertLTT, pch=19, cex=0.5, col="orchid4")
plot(time_points, empiricalLTT, type="l", ylim=c(0,120), main="Number of observed lineages through time", col="plum3")
points(time_points, empiricalLTT, pch=19, cex=0.5, col="plum3")
lines(time_points, expertLTT, col="orchid4", lwd=2)
```

## Standardized counts and subsampling

Standardize the number of occurrences by the number of lineages, and subsample to erase the sampling bias. Subsampling is done by calculating the probability for each row, interpolating for time points between values, and subsampling accordingly.

```{r fig.asp=0.3, fig.width=5}
sOTT <- OTT/empiricalLTT                         # LTT-standardized occurrences through time
names(sOTT) <- time_points
interpolate_curve <- function(x_grid, x, y){
  closest_x <- x_grid[order(abs(x_grid-x))][1:2]
  x1 <- closest_x[1]
  x2 <- closest_x[2]
  y1 <- y[x_grid==x1]
  y2 <- y[x_grid==x2]
  return (y1 + (y2-y1)*(x-x1)/(x2-x1))    # linear interpolation
  # return (y1 * (y2/y1)**((x-x1)/(x2-x1)))    # exponential interpolation
  # return (ifelse(y1<y2, y1 + (1+y2-y1)**((x-x1)/(x2-x1)) - 1,
  #                               y2 + (1+y1-y2)**((x-x2)/(x1-x2)) - 1))    # alternative exponential interpolation
}
sOTT_ref <- round(quantile(sOTT, 0.5, na.rm=T))  # the reference nb of occurrences per lineage used for subsampling

sampling_proba <- function(triton_row){
  age_ratio <- interpolate_curve(x_grid=time_points, x=as.numeric(triton_row[["age_runif"]]), y=sOTT_ref/sOTT)
  return(min(age_ratio, 1))
}

triton.ss <- triton[as.logical(rbinom(n=nrow(triton), size=1, prob=apply(triton, 1, sampling_proba))),]

rbind(triton =    signif(table(as.factor(round(triton$age_runif/10)*10)), 2), 
      triton.ss = signif(table(as.factor(round(triton.ss$age_runif/10)*10)), 2))
```

```{r fig.asp=0.4, fig.width=12}
OTT.ss <- sapply(time_points, function(ti)sum(abs(triton.ss$age_runif - ti) <= diff(time_points)[1]/2))
#OTT <- sapply(time_points, function(ti)sum((triton.ss$Speciation >= ti & ti >= triton.ss$Extinction)/(triton.ss$Speciation-triton.ss$Extinction)))
expertLTT.ss <- sapply(time_points, function(ti)length(unique(triton.ss[triton.ss$Speciation >= ti & ti >= triton.ss$Extinction,]$species)))
empiricalLTT.ss <- sapply(time_points, function(ti)length(unique(triton.ss[abs(triton.ss$age_runif - ti) <= diff(time_points)[1]/2,]$species)))
```


```{r fig.asp=0.4, fig.width=12}
par(mfrow=c(1,2))
plot(time_points, OTT/empiricalLTT, log="y", ylim=c(1,1000), type="l", col="dodgerblue4", main="Number of occurrences per lineage through time")
points(time_points, OTT/empiricalLTT, pch=19, cex=0.5, col="dodgerblue4")
lines(time_points, rep(sOTT_ref, length(time_points)))
plot(time_points, OTT.ss/empiricalLTT, log="y", ylim=c(1,1000), type="l", col="palegreen4", main="Number of occurrences per lineage through time")
points(time_points, OTT.ss/empiricalLTT, pch=19, cex=0.5, col="palegreen4")
lines(time_points, rep(sOTT_ref, length(time_points)))
```

One problem with this method is that it requires having a comprehensive and reliable estimate of the number of lineages through time from experts, which is not available for most clades.

# Geographic subsampling
## Null model of fossil sampling based on plate technotics

This part processes plate tectonic data to model water depths over the Cenozoic.

```{r fig.asp=0.4, fig.width=12}
ages <- gsub(".*_|.tif", "", list.files("../../1-Data_raw/Cenozoic_depth_rasters/"))
# code for extracting water depths
for (age in ages[1+0:floor(length(ages)/5-1)*5]){
  cutoff.rs <- brick(paste0("../../1-Data_raw/Cenozoic_depth_rasters/scot_extrap_Ceno_", age, ".tif"))
  cutoff.rs[cutoff.rs < 200] <- NA # exclude those shallower than 200m
  png(paste0("../../3-Data_processed/Cenozoic_depth_rasters_plots/scot_extrap_Ceno_", age, ".png"))
  plot(cutoff.rs, main=paste(age, "millions years ago"), zlim=c(0,9000))
  dev.off()
}

library(magick)
## list file names and read in
imgs <- list.files("../../3-Data_processed/Cenozoic_depth_rasters_plots/", full.names = TRUE)
img_list <- lapply(rev(imgs), image_read)

## join the images together
img_joined <- image_join(img_list)

## animate at 2 frames per second
img_animated <- image_animate(img_joined, fps = 10)

## view animated image
plot(img_animated)

## save to disk
image_write(image = img_animated, 
            path = "../../3-Data_processed/Cenozoic_depth_rasters_plots/Cenozoic_depth_rasters_animation.gif")
```

**Geographic null model**: Uniform sampling of marine points from each depth raster in cells deeper than 200m, drawing in each bin the same number of occurrences as in Triton, to simulate random sampling of fossils across the Cenozoic.

```{r fig.asp=0.4, fig.width=12, warning=FALSE}
triton_age_table_1My <- table(round(triton$age_runif))

uniform_samples <- c()
for (age in ages[1 + 0:floor(length(ages)/2) * 2]) {
  # Load the depth raster for the given age
  cutoff.rs <- brick(paste0("../../1-Data_raw/Cenozoic_depth_rasters/scot_extrap_Ceno_", age, ".tif"))
  
  # Exclude areas shallower than 200m
  cutoff.rs[cutoff.rs < 200] <- NA

  # Compute the area of each cell using terra::cellSize
  cutoff.rs_spat <- rast(cutoff.rs)  # Convert raster to SpatRaster
  cell_areas <- cellSize(cutoff.rs_spat, unit = "km")  # Area in square kilometers
  
  # Mask the cell areas to match the depth raster (excluding NAs)
  cell_areas <- mask(cell_areas, cutoff.rs_spat)
  
  # Convert the raster to points
  marine_points <- as.data.frame(rasterToPoints(cutoff.rs, spatial = TRUE))
  
  # Extract cell areas corresponding to the marine points
  marine_points$cell_area <- extract(cell_areas, marine_points[c("x","y")])$area
  
  # Remove points with NA area (if any)
  #marine_points <- marine_points[!is.na(marine_points$cell_area), ]
  
  # Sample points with probability proportional to cell area
  sampled_indices <- sample(
    1:nrow(marine_points),
    size = triton_age_table_1My[paste0(as.integer(age))],
    replace = TRUE,
    prob = marine_points$cell_area
  )
  
  # Collect the sampled points
  sampled_points <- marine_points[sampled_indices, c("x", "y")]
  sampled_points$age <- as.numeric(age)
  
  uniform_samples <- rbind(uniform_samples, sampled_points)
}
uniform_samples <- data.frame(uniform_samples)
names(uniform_samples) <-c("long", "lat", "age")

par(mfrow=c(1,2))
hist(uniform_samples$lat, breaks=50, prob=T, xlab="Latitude", main="Latitudinal null distribution of fossil samples")
hist(uniform_samples$long, breaks=50, prob=T, xlab="Longitude", main="Longitudinal null distribution of fossil samples")
```

Null distributions of latitude and longitude for the uniformly sampled fossils, allowing a comparison of uniform fossil sampling with actual fossil occurrences.

```{r fig.asp=0.4, fig.width=12, warning=FALSE}
dty_lat_ref <- density(uniform_samples$lat, from=-90, to=90, cut=T)
dty_lat_obs <- density(triton$pal.lat, adjust=0.5, from=-90, to=90, cut=T)
dty_long_ref <- density(uniform_samples$long, from=-180, to=180, cut=T)
dty_long_obs <- density(triton$pal.long, adjust=0.5, from=-180, to=180, cut=T)

par(mfrow=c(1,2))
hist(uniform_samples$lat, breaks=100, prob=T, xlim=c(-90,90), ylim=c(0,0.02), xlab="Latitude", 
     main="Latitudinal distribution of fossil samples\n(null model vs. observations)")
lines(dty_lat_ref, lwd=2)
hist(triton$pal.lat, breaks=100, prob=T, add=T, col=alpha("red", 0.3))
lines(dty_lat_obs, lwd=2, col="red")
hist(uniform_samples$long, breaks=100, prob=T, xlim=c(-180,180), ylim=c(0,0.01), xlab="Longitude", 
     main="Longitudinal distribution of fossil samples\n(null model vs. observations)")
lines(dty_long_ref, lwd=2)
hist(triton$pal.long, breaks=100, prob=T, add=T, col=alpha("red", 0.3))
lines(dty_long_obs, lwd=2, col="red")
```

Let's subsample by optimizing the sampling probability based on deviations from the expected distributions over time, latitude and longitude.

```{r}
# Harmonic mean
harm_mean <- function(x) return (1 / mean(1 / x, na.rm = TRUE))

# Function to compute sampling probabilities
compute_sampling_probability <- function(dataset, sOTT_ref, dty_lat_ref, dty_long_ref, time_points) {
  # Calculate the number of occurrences per time point (OTT)
  OTT <- sapply(time_points, function(ti)
    sum(abs(dataset$age_runif - ti) <= diff(time_points)[1] / 2, na.rm = TRUE))
  
  # Calculate the number of unique species per time point (empiricalLTT)
  empiricalLTT <- sapply(time_points, function(ti)
    length(unique(dataset[abs(dataset$age_runif - ti) <= diff(time_points)[1] / 2, ]$species)))
  
  # Calculate the sampling rate (occurrences per lineage) for each time point
  sOTT <- OTT / empiricalLTT
  
  # Compute the density of fossil occurrences for latitude and longitude
  dty_lat_obs <- density(dataset$pal.lat, adjust = 0.5, from = -90, to = 90, cut = TRUE, na.rm = TRUE)
  dty_long_obs <- density(dataset$pal.long, adjust = 0.5, from = -180, to = 180, cut = TRUE, na.rm = TRUE)
  
  # Interpolate subsampling scores based on age, latitude, and longitude
  dataset$ss_score_age <- sapply(dataset$age_runif, interpolate_curve,
                                 x_grid = time_points, y = sOTT_ref / sOTT)
  dataset$ss_score_lat <- sapply(dataset$pal.lat, interpolate_curve,
                                 x_grid = dty_lat_ref$x, y = dty_lat_ref$y / dty_lat_obs$y)
  dataset$ss_score_long <- sapply(dataset$pal.long, interpolate_curve,
                                  x_grid = dty_long_ref$x, y = dty_long_ref$y / dty_long_obs$y)
  
  # Calculate the harmonic mean of the subsampling scores
  dataset$ss_score_LMH <- apply(dataset[, c("ss_score_age", "ss_score_lat", "ss_score_long")], 1, harm_mean)
  
  return(dataset)
}

# Function to perform subsampling
subsample_dataset <- function(dataset, sOTT_ref, dty_lat_ref, dty_long_ref, time_points, iterations) {
  for (i in 1:iterations) {
    print(paste("Iteration:", i))
    dataset <- compute_sampling_probability(dataset, sOTT_ref, dty_lat_ref, dty_long_ref, time_points)
    # Subsample by removing the bottom 20% based on ss_score_LMH
    threshold <- quantile(dataset$ss_score_LMH, 0.2, na.rm = TRUE)
    dataset <- dataset[dataset$ss_score_LMH > threshold, ]
  }
  return(dataset)
}

# Assume sOTT_ref, dty_lat_ref, dty_long_ref, and time_points are already defined
# Also, ensure 'interpolate_curve' function is defined

# Original dataset
triton.ss <- triton  # If you have an initial subsampled dataset, otherwise use 'triton'

# Subsample with 6 iterations
triton.ss6 <- subsample_dataset(triton.ss, sOTT_ref, dty_lat_ref, dty_long_ref, time_points, iterations = 6)

# Subsample with additional iterations to reach 15 total
triton.ss15 <- subsample_dataset(triton.ss6, sOTT_ref, dty_lat_ref, dty_long_ref, time_points, iterations = 9)

# Continue subsampling to reach 20 total iterations
triton.ss20 <- subsample_dataset(triton.ss15, sOTT_ref, dty_lat_ref, dty_long_ref, time_points, iterations = 5)
```

```{r}
# Comparing the age distributions after subsampling
rbind(
  triton     = signif(table(as.factor(round(triton$age_runif / 10) * 10)), 2),
  triton.ss6 = signif(table(as.factor(round(triton.ss6$age_runif / 10) * 10)), 2),
  triton.ss15 = signif(table(as.factor(round(triton.ss15$age_runif / 10) * 10)), 2),
  triton.ss20 = signif(table(as.factor(round(triton.ss20$age_runif / 10) * 10)), 2)
)
```
```{r fig.asp=0.5, fig.width=9}
OTT.ss6 <- sapply(time_points, function(ti)sum(abs(triton.ss6$age_runif - ti) <= diff(time_points)[1]/2, na.rm=T))
empiricalLTT.ss6 <- sapply(time_points, function(ti)length(unique(triton.ss6[abs(triton.ss6$age_runif - ti) <= diff(time_points)[1]/2,]$species)))
dty_lat_obs.ss6 <- density(triton.ss6$pal.lat, adjust=0.5, from=-90, to=90, cut=T, na.rm=T)
dty_long_obs.ss6 <- density(triton.ss6$pal.long, adjust=0.5, from=-180, to=180, cut=T, na.rm=T)
OTT.ss15 <- sapply(time_points, function(ti)sum(abs(triton.ss15$age_runif - ti) <= diff(time_points)[1]/2, na.rm=T))
empiricalLTT.ss15 <- sapply(time_points, function(ti)length(unique(triton.ss15[abs(triton.ss15$age_runif - ti) <= diff(time_points)[1]/2,]$species)))
dty_lat_obs.ss15 <- density(triton.ss15$pal.lat, adjust=0.5, from=-90, to=90, cut=T, na.rm=T)
dty_long_obs.ss15 <- density(triton.ss15$pal.long, adjust=0.5, from=-180, to=180, cut=T, na.rm=T)
OTT.ss20 <- sapply(time_points, function(ti)sum(abs(triton.ss20$age_runif - ti) <= diff(time_points)[1]/2, na.rm=T))
empiricalLTT.ss20 <- sapply(time_points, function(ti)length(unique(triton.ss20[abs(triton.ss20$age_runif - ti) <= diff(time_points)[1]/2,]$species)))
dty_lat_obs.ss20 <- density(triton.ss20$pal.lat, adjust=0.5, from=-90, to=90, cut=T, na.rm=T)
dty_long_obs.ss20 <- density(triton.ss20$pal.long, adjust=0.5, from=-180, to=180, cut=T, na.rm=T)
```

```{r fig.asp=0.5, fig.width=15}
# Time
par(mfrow=c(3,4))
plot(time_points, OTT/empiricalLTT, ylim=c(1,1000), log="y", type="l", col="brown", main="Sampling rate through time", xlab="Age (Myrs)", ylab="Occurrences per lineage")
points(time_points, OTT/empiricalLTT, pch=19, cex=0.5, col="brown")
lines(range(time_points), c(sOTT_ref, sOTT_ref), lwd=2)
plot(time_points, OTT.ss6/empiricalLTT.ss6, ylim=c(1,1000), log="y", type="l", col="coral4", main=paste0("Sampling rate through time with ", nrow(triton.ss6) ," fossils"), xlab="Age (Myrs)", ylab="Occurrences per lineage")
points(time_points, OTT.ss6/empiricalLTT.ss6, pch=19, cex=0.5, col="coral4")
lines(range(time_points), c(median(OTT.ss6/empiricalLTT.ss6, na.rm=T), median(OTT.ss6/empiricalLTT.ss6, na.rm=T)), lwd=2)
plot(time_points, OTT.ss15/empiricalLTT.ss15, ylim=c(1,1000), log="y", type="l", col="coral3", main=paste0("Sampling rate through time with ", nrow(triton.ss15) ," fossils"), xlab="Age (Myrs)", ylab="Occurrences per lineage")
points(time_points, OTT.ss15/empiricalLTT.ss15, pch=19, cex=0.5, col="coral3")
lines(range(time_points), c(median(OTT.ss15/empiricalLTT.ss15, na.rm=T), median(OTT.ss15/empiricalLTT.ss15, na.rm=T)), lwd=2)
plot(time_points, OTT.ss20/empiricalLTT.ss20, ylim=c(1,1000), log="y", type="l", col="coral1", main=paste0("Sampling rate through time with ", nrow(triton.ss20) ," fossils"), xlab="Age (Myrs)", ylab="Occurrences per lineage")
points(time_points, OTT.ss20/empiricalLTT.ss20, pch=19, cex=0.5, col="coral1")
lines(range(time_points), c(median(OTT.ss20/empiricalLTT.ss20, na.rm=T), median(OTT.ss20/empiricalLTT.ss20, na.rm=T)), lwd=2)

# Latitude
hist(uniform_samples$lat, breaks=50, prob=T, ylim=c(0,0.02), main="Raw latitudinal distribution", xlab="Latitude", ylab="Fossil sampling density")
lines(dty_lat_ref, lwd=2)
hist(triton$pal.lat, breaks=50, prob=T, add=T, col=alpha("red", 0.1))
lines(dty_lat_obs, lwd=2, col="red")
plot(dty_lat_ref, type="l", lwd=2, ylim=c(0,0.02), main=paste0("Latitudinal distribution with ", nrow(triton.ss6) ," fossils"), xlab="Latitude", ylab="Fossil sampling density")
lines(dty_lat_obs.ss6, lwd=2, col="coral4")
plot(dty_lat_ref, type="l", lwd=2, ylim=c(0,0.02), main=paste0("Latitudinal distribution with ", nrow(triton.ss15) ," fossils"), xlab="Latitude", ylab="Fossil sampling density")
lines(dty_lat_obs.ss15, lwd=2, col="coral3")
plot(dty_lat_ref, type="l", lwd=2, ylim=c(0,0.02), main=paste0("Latitudinal distribution with ", nrow(triton.ss20) ," fossils"), xlab="Latitude", ylab="Fossil sampling density")
lines(dty_lat_obs.ss20, lwd=2, col="coral1")

# Longitude
hist(uniform_samples$long, breaks=50, prob=T, ylim=c(0,0.01), main="Raw longitudinal distribution", xlab="Longitude", ylab="Fossil sampling density")
lines(dty_long_ref, lwd=2)
hist(triton$pal.long, breaks=50, prob=T, add=T, col=alpha("red", 0.1))
lines(dty_long_obs, lwd=2, col="red")
plot(dty_long_ref, type="l", lwd=2, ylim=c(0,0.01), main=paste0("Longitudinal distribution with ", nrow(triton.ss6) ," fossils"), xlab="Longitude", ylab="Fossil sampling density")
lines(dty_long_obs.ss6, lwd=2, col="coral4")
plot(dty_long_ref, type="l", lwd=2, ylim=c(0,0.01), main=paste0("Longitudinal distribution with ", nrow(triton.ss15) ," fossils"), xlab="Longitude", ylab="Fossil sampling density")
lines(dty_long_obs.ss15, lwd=2, col="coral3")
plot(dty_long_ref, type="l", lwd=2, ylim=c(0,0.01), main=paste0("Longitudinal distribution with ", nrow(triton.ss20) ," fossils"), xlab="Longitude", ylab="Fossil sampling density")
lines(dty_long_obs.ss20, lwd=2, col="coral1")
```

This method reduces the temporal and geographical biases, but requires again to know the expected temporal richness trajectory. Let's try a subsampling method that does not use this information.

# Hole-based subsampling

In this section, we aim to reduce sampling biases in our dataset by performing subsampling based on drilling holes (locations where fossils were collected). The goal is to achieve a more uniform sampling effort across different holes and through time.

## Calculating Occurrence Density per Hole

```{r fig.asp=0.4, fig.width=12}
# Number of occurrences, minimum and maximum ages for each hole
HoleNbOcc <- table(triton$holeID)
HoleMinAge <- round(sapply(names(HoleNbOcc), function(holeID)min(triton[triton$holeID == holeID, "age_runif"])), 3)
HoleMaxAge <- round(sapply(names(HoleNbOcc), function(holeID)max(triton[triton$holeID == holeID, "age_runif"])), 3)

# Compute the occurrence density of each hole (avoid division by zero by setting a minimum duration)
HoleDuration <- sapply(HoleMaxAge - HoleMinAge, max, a = 0.001)
HoleDtyOcc <- HoleNbOcc/sapply(HoleMaxAge-HoleMinAge, max, a=0.001)

# Compute the number of active holes through time (HTT)
HTT <- sapply(time_points, function(ti)length(which(round(HoleMinAge, 2)<=ti & ti<=round(HoleMaxAge, 2))))

# Create a data frame for plotting
hole_data <- data.frame(
  HoleMinAge = HoleMinAge,
  HoleMaxAge = HoleMaxAge,
  HoleDtyOcc = as.vector(HoleDtyOcc)
)

# Plot occurrence density per hole over time
ggplot(hole_data) +
  geom_linerange(aes(y = HoleDtyOcc, xmin = HoleMinAge, xmax = HoleMaxAge,
                     color = HoleDtyOcc), linewidth = 0.3) +
  #scale_color_continuous("Occurrence Density", trans = "log10") +
  scale_color_gradient(low = "lightblue", high = "dodgerblue4", name = "Occurrence Density", trans = "log10") +
  scale_y_log10("Occurrence Density", breaks = c(1, 100, 10000)) +
  labs(title = "Drilling Holes Over Time and their Density of Occurrences")
```

This plot highlights holes with unusually high densities that may introduce sampling bias.

## Subsample at the Sediment Sample level

In this section, we focus on subsampling at the sample level to reduce sampling biases by homogenizing the number of sediment samples per hole through time. This method aims to create a more balanced dataset by adjusting for overrepresented holes and time periods.

### Visualizing the Occurrence Density per Sample and the Sample Density per Hole

- `HoleNbSample`: Number of unique samples collected from each hole.
- `HoleDtySample`: Density of samples per hole, adjusted for the duration of sampling at each hole.
- `STT`: Number of samples collected at each time point.

```{r fig.asp=0.4, fig.width=12}
# Create a data frame of sample counts per sampleID
samples <- data.frame(nb = as.matrix(table(triton$sampleID)))
samples$age <- triton[sapply(rownames(samples), match, table = triton$sampleID), ]$age

# Calculate the number of unique samples per hole
HoleNbSample <- sapply(names(HoleNbOcc), function(holeID)
  length(unique(triton[triton$holeID == holeID, "sampleID"])))

# Calculate the density of samples per hole (number of samples per unit time)
HoleDtySample <- HoleNbSample / sapply(HoleMaxAge - HoleMinAge, max, a = 0.001)

# Compute the number of samples through time (STT)
STT <- hist(samples$age, breaks = seq(min(time_points), max(time_points), length = length(time_points) + 1), plot = FALSE)$count

# Avoid division by zero
STT[STT == 0] <- 1

ggplot(samples, aes(x = age, y = nb)) + 
  geom_point(alpha = 0.1, size = 0.5) +
  scale_x_continuous(name = "Age of the Sample (Ma)") +
  scale_y_continuous(name = "Number of Occurrences per Sample") +
  stat_smooth(formula = y ~ s(x), method = "gam", method.args = list(family = "nb")) +
  labs(title = "Occurrences per Sample Over Time")
```

The mean number of occurrences per sample looks much more like the distribution of species over time. Let's look at this quantity directly.

- `SpHTT` = Samples per hole through time
- `OpSTT` = Occurrences per sample through time

```{r fig.asp=0.3, fig.width=12}
par(mfrow = c(1, 3))

# Plot the number of holes through time
plot(time_points, HTT, type = "l", main = "Number of Holes Through Time", xlab = "Time (Ma)", ylab = "Number of Holes", col="dodgerblue4")
points(time_points, HTT, pch = 19, cex = 0.5, col="dodgerblue4")

# Calculate the number of samples per hole and number of occurrences per sample through time
OpSTT <- OTT / STT

# Plot the number of samples per hole through time
plot(loess.smooth(time_points, STT, span = 0.1), type = "l", lwd = 3, col="dodgerblue4",
     main = "Number of Sediment Samples Through Time", xlab = "Time (Ma)", ylab = "Number of Samples")
points(time_points, STT, pch = 19, cex = 0.5, col = alpha("dodgerblue4", 0.3))

# Plot the standardized distribution of occurrences through time
plot(loess.smooth(time_points, OpSTT * 6, span = 0.1), type = "l", lwd = 3, col="palegreen4", ylim = c(0, 100),
     main = "Occurrences per Sample Through Time", xlab = "Time (Ma)", ylab = "Occurrences per Sample (x6)")
points(time_points, OpSTT * 6, pch = 19, cex = 0.5, col = alpha("palegreen4", 0.3))
lines(time_points, expertLTT, col = "orchid4", lwd=2)
```

### Subsampling - Homogenize the Number of Samples Through Time (ss.STT)

```{r}
# Define the reference number of samples per time bin (e.g., 25th percentile)
STT_ref <- quantile(STT, 0.25)

# Function to calculate sampling probability for each sample based on its age
sampling_proba_sample <- function(sample_age) {
  # Interpolate the ratio of desired to actual number of samples at the sample's age
  ratio <- interpolate_curve(x_grid = time_points, x = sample_age, y = STT_ref / STT)
  # Ensure the probability does not exceed 1
  return(min(ratio, 1))
}

# Calculate sampling probabilities for all samples
samples$proba <- sapply(samples$age, sampling_proba_sample)

# Subsample the samples based on calculated probabilities
set.seed(123)  # For reproducibility
sampled_sampleIDs <- rownames(samples)[as.logical(rbinom(n = nrow(samples), size = 1, prob = samples$proba))]

# Create the subsampled dataset
triton.ss.STT <- triton[triton$sampleID %in% sampled_sampleIDs, ]
```

```{r}
# Recalculate STT and OTT after subsampling
samples.ss.STT <- data.frame(
  nb = sapply(unique(triton.ss.STT$sampleID), function(sid) nrow(triton.ss.STT[triton.ss.STT$sampleID == sid, ])),
  age = sapply(unique(triton.ss.STT$sampleID), function(sid) triton.ss.STT[triton.ss.STT$sampleID == sid, ]$age[1])
)

STT.ss.STT <- hist(samples.ss.STT$age, breaks = seq(min(time_points), max(time_points), length = length(time_points) + 1), plot = FALSE)$count
STT.ss.STT[STT.ss.STT == 0] <- 1  # Avoid division by zero

OTT.ss.STT <- sapply(time_points, function(ti)
  sum(abs(triton.ss.STT$age_runif - ti) <= diff(time_points)[1] / 2, na.rm = TRUE))

# Recalculate the number of holes through time (HTT) after subsampling
HoleMinAge.ss.STT <- sapply(unique(triton.ss.STT$holeID), function(holeID)
  min(triton.ss.STT[triton.ss.STT$holeID == holeID, "age_runif"]))
HoleMaxAge.ss.STT <- sapply(unique(triton.ss.STT$holeID), function(holeID)
  max(triton.ss.STT[triton.ss.STT$holeID == holeID, "age_runif"]))
HTT.ss.STT <- sapply(time_points, function(ti)
  length(which(round(HoleMinAge.ss.STT, 2) <= ti & round(HoleMaxAge.ss.STT, 2) >= ti)))
```

```{r fig.asp=0.4, fig.width=12}
par(mfrow = c(1, 2))

# Plot samples per hole through time before and after subsampling
plot(loess.smooth(time_points, STT / HTT, span = 0.05), type = "l", lwd = 2, col = "dodgerblue4",
     ylim = c(0.01, 2.5), main = "Samples per Hole Through Time",
     xlab = "Time (Ma)", ylab = "Samples per Hole")
points(time_points, STT / HTT, pch = 19, cex = 0.5, col = alpha("dodgerblue4", 0.3))
lines(loess.smooth(time_points, STT.ss.STT / HTT.ss.STT, span = 0.05), lwd = 2, col = "palegreen4")
points(time_points, STT.ss.STT / HTT.ss.STT, pch = 19, cex = 0.5, col = alpha("palegreen4", 0.3))

# Plot number of holes through time before and after subsampling
plot(time_points, HTT, type = "l", col = "dodgerblue4", main = "Number of Holes Through Time",
     xlab = "Time (Ma)", ylab = "Number of Holes")
points(time_points, HTT, pch = 19, col = "dodgerblue4", cex = 0.5)
lines(time_points, HTT.ss.STT, col = "palegreen4")
points(time_points, HTT.ss.STT, pch = 19, cex = 0.5, col = "palegreen4")
```


```{r fig.asp=0.5, fig.width=12}
par(mfrow = c(1, 2), mar = c(4, 4, 3, 4) + 0.1)

# Plot samples through time before and after subsampling
plot(loess.smooth(time_points, STT, span = 0.2), type = "l", lwd = 1, col = "dodgerblue4", log="y", ylim=c(10,1000),
     main = "Samples Through Time after Subsampling", xlim = rev(range(range(time_points))), xlab = "Time (Ma)", ylab = "Number of Sediment Samples")
points(time_points, STT, pch = 19, cex = 0.5, col = alpha("dodgerblue4", 0.3))
lines(loess.smooth(time_points, STT.ss.STT, span = 0.2), lwd = 3, col = "palegreen4")
points(time_points, STT.ss.STT, pch = 19, cex = 0.5, col = alpha("palegreen4", 0.3))

# Plot occurrences through time before and after subsampling
plot(loess.smooth(time_points, OTT, span = 0.2), type = "l", lwd = 1, col = "dodgerblue4", log = "y",
     main = "Occurrences Through Time after Subsampling", xlim = rev(range(range(time_points))), xlab = "Time (Ma)", ylab = paste0("Number of occurrences"))
points(time_points, OTT, pch = 19, cex = 0.5, col = alpha("dodgerblue4", 0.3))
lines(loess.smooth(time_points, OTT.ss.STT, span = 0.1), lwd = 3, col = "palegreen4")
points(time_points, OTT.ss.STT, pch = 19, cex = 0.5, col = alpha("palegreen4", 0.3))
par(new = TRUE)
plot(time_points, expertLTT, type = "l", col = "orchid4", lwd = 3, xlim = rev(range(range(time_points))),
     axes = FALSE, ylim=c(10,10000), xlab = "", ylab = "", log = "y")
axis(4, col = "orchid4", col.axis = "orchid4", las = 1, labels = c("10","20","50","100"), at = c(10,20,50,100))
mtext("Number of lineages", side = 4, line = 3, adj = 0.02, col = "orchid4")

pdf("Images/STT_subsampling.pdf", width = 2.8, height = 2.8)
par(mar = c(3, 3, 0.5, 0.5) + 0.1, mgp = c(2.1, 0.7, 0))
# Plot samples through time before and after subsampling
plot(loess.smooth(time_points, STT, span = 0.2), type = "l", lwd = 1, col = "dodgerblue4", log="y", ylim=c(10,1000),
     main = "", xaxt = "n", yaxt = "n", xlim = rev(range(range(time_points))), xlab = "Time (Ma)", ylab = "Number of Sediment Samples")
points(time_points, STT, pch = 19, cex = 0.3, col = alpha("dodgerblue4", 0.3))
lines(loess.smooth(time_points, STT.ss.STT, span = 0.2), lwd = 2, col = "palegreen4")
points(time_points, STT.ss.STT, pch = 19, cex = 0.3, col = alpha("palegreen4", 0.3))
axis(1, at = pretty(range(time_points), n = 4))
axis(2, at = c(10, 50, 200, 1000))
dev.off()

pdf("Images/OTT_subsampling.pdf", width = 3.2, height = 2.7)
par(mar = c(3, 3, 0.5, 3.5) + 0.1, mgp = c(2.1, 0.7, 0))
# Plot occurrences through time before and after subsampling
plot(loess.smooth(time_points, OTT, span = 0.2), type = "l", lwd = 1, col = "dodgerblue4", log = "y",
     main = "", xaxt = "n", yaxt = "n", xlim = rev(range(range(time_points))), xlab = "Time (Ma)", ylab = paste0("Number of occurrences"))
points(time_points, OTT, pch = 19, cex = 0.3, col = alpha("dodgerblue4", 0.3))
lines(loess.smooth(time_points, OTT.ss.STT, span = 0.1), lwd = 2, col = "palegreen4")
points(time_points, OTT.ss.STT, pch = 19, cex = 0.3, col = alpha("palegreen4", 0.3))
axis(1, at = pretty(range(time_points), n = 4))
axis(2, at = c(100, 300, 1000, 5000))
par(new = TRUE)
plot(time_points, expertLTT, type = "l", col = "orchid4", lwd = 2, xlim = rev(range(range(time_points))),
     axes = FALSE, ylim=c(10,10000), xlab = "", ylab = "", log = "y")
axis(4, col = "orchid4", col.axis = "orchid4", las = 1, labels = c("10","20","50","100"), at = c(10,20,50,100))
mtext("Number of lineages", side = 4, line = 2.3, adj = 0, col = "orchid4")
dev.off()
```

The number of occurrences after subsampling reflects very well the number of lineages designed by experts.

```{r fig.asp=0.4, fig.width=12}
HoleNbSample.ss.STT <- sapply(names(HoleMaxAge.ss.STT), function(holeID)length(unique(triton.ss.STT[triton.ss.STT$holeID == holeID, "sampleID"])))
HoleDtySample.ss.STT <- HoleNbSample.ss.STT/sapply(HoleMaxAge.ss.STT-HoleMinAge.ss.STT, max, a=0.001)

ggplot(data.frame(HoleMinAge=HoleMinAge, HoleMaxAge=HoleMaxAge, HoleDtySample=as.vector(HoleDtySample))) +
  geom_linerange(aes(y=HoleDtySample, xmin=HoleMinAge, xmax=HoleMaxAge, col=HoleDtySample), lwd=0.3) +
  scale_color_gradient(low = "lightblue", high = "dodgerblue4", name = "Sample density", trans = "log10") +
  scale_y_log10("Sample density", breaks=c(1,100,10000), lim=c(1e-2, 25000))

ggplot(data.frame(HoleMinAge=HoleMinAge.ss.STT, HoleMaxAge=HoleMaxAge.ss.STT, HoleDtySample=as.vector(HoleDtySample.ss.STT))) +
  geom_linerange(aes(y=HoleDtySample, xmin=HoleMinAge, xmax=HoleMaxAge, col=HoleDtySample), lwd=0.3) +
  scale_color_gradient(low = "darkolivegreen3", high = "palegreen4", name = "Sample density", trans = "log10") +
  scale_y_log10("Sample density", breaks=c(1,100,10000), lim=c(1e-2, 25000))
```

## Check spatial biases

```{r fig.asp=0.5, fig.width=12}
empiricalLTT.ss.STT <- sapply(time_points, function(ti)length(unique(triton.ss.STT[abs(triton.ss.STT$age_runif - ti) <= diff(time_points)[1]/2,]$species)))
dty_lat_obs.ss.STT <- density(triton.ss.STT$pal.lat, adjust=0.5, from=-90, to=90, cut=T, na.rm=T)
dty_long_obs.ss.STT <- density(triton.ss.STT$pal.long, adjust=0.5, from=-180, to=180, cut=T, na.rm=T)

# Time
par(mfcol=c(2,3))
plot(time_points, OTT/empiricalLTT, log="y", ylim=c(1,1000), type="l", col="brown", main="Sampling rate through time", xlab="Age (Myrs)", ylab="Occurrences per lineage")
points(time_points, OTT/empiricalLTT, pch=19, cex=0.5, col="brown")
plot(time_points, OTT.ss.STT/empiricalLTT.ss.STT, log="y", ylim=c(1,1000), type="l", col="coral4", main=paste0("Sampling rate through time with ", nrow(triton.ss.STT) ," fossils"), xlab="Age (Myrs)", ylab="Occurrences per lineage")
points(time_points, OTT.ss.STT/empiricalLTT.ss.STT, pch=19, cex=0.5, col="coral4")

# Latitude
hist(uniform_samples$lat, breaks=50, prob=T, ylim=c(0,0.02), main="Raw latitudinal distribution", xlab="Latitude", ylab="Fossil sampling density")
lines(dty_lat_ref, lwd=2)
hist(triton$pal.lat, breaks=50, prob=T, add=T, col=alpha("red", 0.1))
lines(dty_lat_obs, lwd=2, col="red")
text(x=70, y=0.015, paste("WD =", signif(transport::wasserstein1d(dty_lat_ref$y, dty_lat_obs$y), 2)))
plot(dty_lat_ref, type="l", lwd=2, ylim=c(0,0.02), main=paste0("Latitudinal distribution with ", nrow(triton.ss.STT) ," fossils"), xlab="Latitude", ylab="Fossil sampling density")
lines(dty_lat_obs.ss.STT, lwd=2, col="coral4")
text(x=70, y=0.015, paste("WD =", signif(transport::wasserstein1d(dty_lat_ref$y, dty_lat_obs.ss.STT$y), 2)))

# Longitude
hist(uniform_samples$long, breaks=50, prob=T, ylim=c(0,0.02), main="Raw longitudinal distribution", xlab="Longitude", ylab="Fossil sampling density")
lines(dty_long_ref, lwd=2)
hist(triton$pal.long, breaks=50, prob=T, add=T, col=alpha("red", 0.1))
lines(dty_long_obs, lwd=2, col="red")
text(x=120, y=0.015, paste("WD =", signif(transport::wasserstein1d(dty_long_ref$y, dty_long_obs$y), 2)))
plot(dty_long_ref, type="l", lwd=2, ylim=c(0,0.02), main=paste0("Longitudinal distribution with ", nrow(triton.ss.STT) ," fossils"), xlab="Longitude", ylab="Fossil sampling density")
lines(dty_long_obs.ss.STT, lwd=2, col="coral4")
text(x=120, y=0.015, paste("WD =", signif(transport::wasserstein1d(dty_long_ref$y, dty_long_obs.ss.STT$y), 2)))
```

## Compare to simulated homogeneous sampling

```{r}
fossil_sampling <- as.data.frame(t(sapply(unique(triton$species), function(sp){triton_spi <- triton[triton$species==sp,]; return(c(nb_fossils=nrow(triton_spi), duration=triton_spi$Speciation[1]-triton_spi$Extinction[1]))})))
fossil_sampling.ss.STT <- as.data.frame(t(sapply(unique(triton.ss.STT$species), function(sp){triton_spi <- triton.ss.STT[triton.ss.STT$species==sp,]; return(c(nb_fossils=nrow(triton_spi), duration=triton_spi$Speciation[1]-triton_spi$Extinction[1]))})))
```

```{r fig.asp=0.6, fig.width=8, warning=FALSE}
psi <- sum(fossil_sampling$nb_fossils)/sum(fossil_sampling$duration)
psi.ss.STT <- sum(fossil_sampling.ss.STT$nb_fossils)/sum(fossil_sampling.ss.STT$duration)
fossil_sampling.df <- data.frame(duration=c(fossil_sampling$duration, fossil_sampling.ss.STT$duration, fossil_sampling$duration, fossil_sampling.ss.STT$duration), nb.fossils=c(fossil_sampling$nb_fossils, fossil_sampling.ss.STT$nb_fossils, rpois(length(fossil_sampling$duration), fossil_sampling$duration*psi), rpois(length(fossil_sampling.ss.STT$duration), fossil_sampling.ss.STT$duration*psi.ss.STT)), origin=c(rep("Triton", nrow(fossil_sampling)), rep("Subsampled Triton", nrow(fossil_sampling.ss.STT)), rep("Simulation (~Triton)", nrow(fossil_sampling)), rep("Simulation (~subsampled Triton)", nrow(fossil_sampling.ss.STT))))

p <- ggplot(fossil_sampling.df, aes(x=duration, y=nb.fossils, col=origin, alpha=origin, shape=origin)) +
  geom_point(cex=2) +
  scale_color_discrete(limits = c("Simulation (~Triton)", "Triton", "Simulation (~subsampled Triton)", "Subsampled Triton"),
                       type = c("#040A3D",  "dodgerblue4", "#022B0B", "palegreen4")) +
  scale_alpha_manual(limits = c("Simulation (~Triton)", "Triton", "Simulation (~subsampled Triton)", "Subsampled Triton"),
                       values = c(0.4, 0.2, 0.4, 0.2)) +
  scale_shape_manual(limits = c("Simulation (~Triton)", "Triton", "Simulation (~subsampled Triton)", "Subsampled Triton"),
                     values = c(15, 16, 15, 16)) +
  scale_x_continuous(trans = "log1p", name="Species lifetime (Myr)", breaks = c(0,1,10,50)) +
  scale_y_log10(name="Number of fossils") + 
  guides(
    shape = guide_legend(override.aes = list(size = 5)),
    color = guide_legend(nrow = 2)
  ) +
  theme_minimal() +
  theme(
    panel.background = element_rect(fill = NA, color = "grey70"),
    panel.grid.major = element_blank(),
    panel.grid.minor = element_blank(),
    rect = element_rect(fill = "transparent"),
    legend.position = "bottom",
    legend.title = element_blank(),
    plot.title = element_text(size = 12), 
    strip.text = element_text(size = 12),
    legend.text = element_text(size = 11)
  ) + 
  facet_wrap(sapply(grepl("sampled", origin), ifelse, yes="Subsampled database", no="Initial database")~.)

p +  ggtitle("Observed fossil sampling compared to a homogeneous process")
ggsave("Images/Empirical_versus_homogeneous_sampling.pdf", p, width = 5, height = 3.5)
```

# Save objects

```{r}
write.csv(triton.ss.STT, paste0("../../3-Data_processed/Triton_occurrences/TritonDB_subsampled_STT_",  nrow(triton.ss.STT), "foss.csv"))

write.csv(time_points, "../../3-Data_processed/Triton_occurrences/time_points.csv", row.names=F)
write.csv(OTT, "../../3-Data_processed/Triton_occurrences/OTT.csv", row.names=F)
write.csv(expertLTT, "../../3-Data_processed/Triton_occurrences/expertLTT.csv", row.names=F)
write.csv(empiricalLTT, "../../3-Data_processed/Triton_occurrences/empiricalLTT.csv", row.names=F)
write.csv(OTT.ss.STT, paste0("../../3-Data_processed/Triton_occurrences/OTT_subsampled_STT_",  nrow(triton.ss.STT), "foss.csv"), row.names=F)
write.csv(empiricalLTT.ss.STT, paste0("../../3-Data_processed/Triton_occurrences/empiricalLTT_subsampled_STT_",  nrow(triton.ss.STT), "foss.csv"), row.names=F)
```

```{r}
#write.csv(triton.ss6, paste0("../../3-Data_processed/Triton_occurrences/TritonDB_subsampled_",  nrow(triton.ss6), "foss.csv"))
#write.csv(triton.ss15, paste0("../../3-Data_processed/Triton_occurrences/TritonDB_subsampled_",  nrow(triton.ss15), "foss.csv"))
#write.csv(triton.ss20, paste0("../../3-Data_processed/Triton_occurrences/TritonDB_subsampled_",  nrow(triton.ss20), "foss.csv"))

#write.csv(OTT.ss6, paste0("../../3-Data_processed/Triton_occurrences/OTT_",  nrow(triton.ss6), "foss.csv"), row.names=F)
#write.csv(empiricalLTT.ss6, paste0("../../3-Data_processed/Triton_occurrences/empiricalLTT_",  nrow(triton.ss6), "foss.csv"), row.names=F)
#write.csv(OTT.ss15, paste0("../../3-Data_processed/Triton_occurrences/OTT_",  nrow(triton.ss15), "foss.csv"), row.names=F)
#write.csv(empiricalLTT.ss15, paste0("../../3-Data_processed/Triton_occurrences/empiricalLTT_",  nrow(triton.ss15), "foss.csv"), row.names=F)
#write.csv(OTT.ss20, paste0("../../3-Data_processed/Triton_occurrences/OTT_",  nrow(triton.ss20), "foss.csv"), row.names=F)
#write.csv(empiricalLTT.ss20, paste0("../../3-Data_processed/Triton_occurrences/empiricalLTT_",  nrow(triton.ss20), "foss.csv"), row.names=F)
```


